Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d4efb603c12c50…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 16:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dae4d3f76601fe0b9567b048e4216016 SHA-1: c4b2d6a6f57496e3eb8e2730c5f4661d637206df SHA-256: f2d4efb603c12c5034e4a9f2b8a653ae568c3f0487c8c5a8ffa7fba46e28b023
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, designed to host and distribute malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests a common tactic of password-protecting archives to evade gateway scanning, with the password likely provided separately. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dsif0kmmh5uno3jg414ktujse7/lewokoro.pdf In PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/27895554078.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/25655032266.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/xixepozarev.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/34546687443.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/10704414639.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/c86bfca701edde647292a5f247976c08/kuxurofedepudasadowezome.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b77964cad---31263149320.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/wirenejogivezipanujetamox.pdfIn PDF document text
    • http://edituj.cz/res/file/70617207800.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/wotevisejowofaz.pdfIn PDF document text
    • http://imi.vc/upload/files/61926010482.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/kusenume.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f198f18870---80769299837.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613655aa11c4f---minefolefojovezes.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80e505201---88375953044.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/15407623351.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/bogefegotapovux.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/tizegozomatofeme.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/jaruzofiguzerigudapum.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/49361820293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=confesion+jodi+ellen+malpas+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 10620 bytes
SHA-256: 97d6c32b82c47d8bc8709cdcdb9226aaa43ca0bce12f1980a3579b9f0f2f251c
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 19588 bytes
SHA-256: 9dfa57701b398256d3aa07415149e5b2a2cb25587060afbc07eeb4fd17ebedb2

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